"The first principle is that you must not fool yourself and you are the easiest person to fool." - Richard P. Feynman

"Never wrestle with pigs. You both get dirty and the pig likes it." - George Bernard Shaw

"I get that feeling all the time: that I am an ape trying to put two sticks together. So I always feel stupid. Once in a while, though, the sticks go together on me and I reach the banana." - Richard P. Feynman

"The brain never make mistakes but sometimes it doesn't have enough information to make good decisions" - H.A

"At first you probably won't understand this but then you will do a lot of exercises until suddenly one day you start thinking you understand it." - N.W.